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Technical Discussions
Kim
Kim
07:47 Nov-10-2005
X-Ray of Aluminium pipe butt-welds

Hi all,

I am new to this forum and havent done any rad since about 1985, Please can any bombers help me with some info on this:

I need to know the following:

1 How to calculate "Diagnostic Film Length" on a
radiograph??
2 On O/D pipe of 6" (DWSI) & above my contractor should be
using 2 xIQI`s, am i correct ??
3 Paper screens instead of lead ??
4 Contractor is using Agfa structurix D7 with X-Ray - I
requested D4 For better resolution - I seem to remember
for stainless we always used this so why not for AL ??
5 Contractor is using ASTM wire type but he does not know
the wire thickness in order to calculate sensitivity.
6 Welders are using a SS Non fusible backing insert band,
how does this affect calculating the sensitivity.
7 Any help with exposure times, KV & Ma & SFD's settings for
varying dia and wt (I used to have a note book which i
recorded everything - If only !!!!)

I am on an Island project in mexico and the contractor is the only local one and he has bombed 20 butts from 3" - 36" with varying degrees of success. I hold an interp cert and used to be a bomber many yrs ago so I can understand his position. he's never been asked to X-Ral Al here before so he is trying his best. I would rather work with him to find acceptable quality graphs instead of bringing another contractor in.
Any help on this matter from experienced rad techs would be greatly appreciated.

best regards,

kim




    
 
 Reply 
 
Collin Mal
Collin Mal
09:30 Nov-11-2005
Re: X-Ray of Aluminium pipe butt-welds
----------- Start Original Message -----------
: Hi all,
: I am new to this forum and havent done any rad since about 1985, Please can any bombers help me with some info on this:
: I need to know the following:
: 1 How to calculate "Diagnostic Film Length" on a
: radiograph??
: 2 On O/D pipe of 6" (DWSI) & above my contractor should be
: using 2 xIQI`s, am i correct ??
: 3 Paper screens instead of lead ??
: 4 Contractor is using Agfa structurix D7 with X-Ray - I
: requested D4 For better resolution - I seem to remember
: for stainless we always used this so why not for AL ??
: 5 Contractor is using ASTM wire type but he does not know
: the wire thickness in order to calculate sensitivity.
: 6 Welders are using a SS Non fusible backing insert band,
: how does this affect calculating the sensitivity.
: 7 Any help with exposure times, KV & Ma & SFD's settings for
: varying diaand wt (I used to have a note book which i
: recorded everything - If only !!!!)
: I am on an Island project in mexico and the contractor is the only local one and he has bombed 20 butts from 3" - 36" with varying degrees of success. I hold an interp cert and used to be a bomber many yrs ago so I can understand his position. he's never been asked to X-Ral Al here before so he is trying his best. I would rather work with him to find acceptable quality graphs instead of bringing another contractor in.
: Any help on this matter from experienced rad techs would be greatly appreciated.
: best regards,
: kim
------------ End Original Message ------------
1. Go to codal requirements in pipe code as Asme 5 etc
2. 1 min if DWS
3. yes
4. D7 no problem as "X" D7 is very sensitive
5. Use ASTM wire IQI for AL and then go to ASME 5 charts
6. Backing bar is not permanent and is not included in calculation.
7. Too many to list but 100Kv x 3.75Ma x 22 seconds at 1 meter SFD is a start.



    
 
 Reply 
 

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